Carburetor deicer



y 1952 J. 'r. w. 'MOSELEY CARBURETOR DEICER Filed Jan. 25, 1950 2SHEETS-SHEET 1 22 O F IC. 2.

O o I INVENTOR. JAMES T.W. MOS ELEY I 27 BY TOBNEY July 15,- 1952 J. T.w. MOSELEY CARBURETOR DEICER 2 SHEETS-SHEET 2 Filed Jan. 23, 1950INVENTOR.

ATTORNEY Patented July 15, 1952 CARBURETOR DEICER James T. W. Moseley,Richmond Heights, Mo., assignor to Carter Carburetor Corporation, St.Louis, Mo., a corporation of Delaware Application January 23, 1950,Serial No. 139,988

The invention is especially applicable to V- type engines of a knowntype in which the intake manifolding rests on the upper side of thecylinder block in the crotch of the V and exhaust passages extend bothabove and beneath the cylinder block. According to the presentinvention, a by-pass for hot exhaust gases extends from the portion ofthe exhaust manifolding which overlies the cylinder block up through theintake riser, thence across "the carburetor flange and returns throughthe riser to the exhaust passage. This exhaust by-pass has been found toeffectively counteract icing tendencies around the carburetor throttleand idling ports.

In the accompanying drawings which trate the invention,

Fig. l is an end view and section showing the engine and portions of theexhaust and intake manifolds and the carburetor;

Fig. 2 is a top view of the engine with the carburetor removed;

Fig. 3 is an enlarged side view of the throttle body portion of thecarburetor disassembled;

Fig. 4 is a bottom view of the structure in Fig. 3;

Fig. 5 is an enlarged view of the exhaust gas diverting valve andmounting and operating structure;

Fig. 6 is an enlarged section through the throttle body portion only ofthe carburetor and taken at 90 to Fig. 1. The carburetor H] is of thedual type including a pair of downdraft mixture conduits H with throttlevalves l2 in the outlet portions thereof. An arm 13 attached to thecommon throttle shaft l4 provides for manual control of the throttlevalves. The lower portion of the carburetor which mounts the throttlevalves is separately formed, as shown in Figs. 36, inclusive, and isknown as the throttle body. This member has an upper flange l5 forattachment to the upper portion of the carburetor and a lower flange I6which is bolted to the riser portion ll of the intake manifold.

The intake manifold riser portion ll includes a pair of intake passages18 and ill, one longer than the other as shown, communicating at theirlower extremities with ducts 23 and 2|, forming part of the intakemanifolding 22 leading to the intake valves (not shown) of the engine.The upper surface 23 of the riser conforms in shape 1 Claim. (01.123-122) valve for each cylinder.

with the lower surface of carburetor endfiange l6 for accommodating asealing gasket and for bolting attachment to the carburetor.

The engine block, generally shown at 25, is of the V-type havingseparate banks of cylinders 26 and 21 forming the legs of the V. Intakemanifold 22 is of general H-shape and lies above the engine block in thecrotch of the V. A pair of exhaust valves are shown at 30 and 3lcontrolling exhaust ports each leading to exhaust passages 32 and 33,leading oppositely. In an eight cylinder engine, there will be fourcylinders in each bank and an intake and exhaust The intake connectionsto the cylinder are not shown, in detail. Upwardly leading exhaustpassages 33 connect with an exhaust cross passage 34 which extendsbeneath and abuts intake riser I! to form a hot spot for heating intakemixture. Out-' wardly disposed exhaust passages 32 connect withlongitudinal exhaust manifold branches 35. Branches 35 connect with theexhaust ports of the respective banks.

Right hand exhaust branch 35 connects with a cross passage 36 extendingbeneath the engine block. A spacer 31 between right hand manifold 35 andunderlying cross passage 36 pivotally mounts an unbalanced butterflyvalve 38 (Fig. 5) on a shaft 39. An unbalanced weight 40 rigid with thevalve shaft tends to open the valve as does the force of the exhaust onthe unbalanced valve, itself. A bi-metal thermostat coil 4! has one endsecured to the valve shaft and the other end anchored to a pin 42 on thespacer and urges the valve closed when the engine temperature is low,while opening the valve when the temperature rises. Left-hand exhaustmanifold branch 35 has a connection to tail pipe 5| and thence toatmosphere. Underlying exhaust cross passage 36 also connects with tailpipe 5|.

The arrangement of exhaust manifolding is such that exhaust gases mayflow from the right hand cylinder bank both upwardly through exhaustpassage 33, thence through overlying cross passage 34 and the hot spot,then through exhaust passage portions 33 and 32 of the left-handcylinder bank and connection 50 to tail pipe 5|. The exhaust gases fromthe right hand bank may also flow downwardly through exhaust passage 32and underlying exhaust cross passage 36, if exhaust diverting valve 38is open. This valve, however, will be urged towards its closed positionat low temperatures so as to divert substantial portions of exhaustgases from the right hand bank of cylinder through the overlying exhaustpassage 34 and through the hot spot portion so as to heat the fuelmixture in the intake manifold.

Fig. 6 illustrates the idling fuel passage 53 and idle ports 54 and 55formed in the throttle body portion of the carburetor adjacent andposterior to the edge of throttle valve I2 when closed. Fuel issuingfrom the idling ports and also air passing the throttle tends to expand,thus absorbing heat and, under certain conditions, ice may be formedwhich tends to block both the passage of air around the throttle and theissuance of fuel from the idling ports.

In order to counteract this tendency, an exhaust by-pa-ss is provided,including a passage 51 extending upwardly along riser H from exhaustmanifold cross passage 34, thence through a recess 58 formed in theunder surface of .carburetor end flange [6 and then returning to exhaustpassage 34 through passage 59 in the riser. During operation,significant quantities of hot exhaust gases will be directed throughby-pass T, 58, and 59, particularly, when diverter valve 38 is closed.When valve 38 is open, less gases flow through the by-pass. A flowthrough the passage will result from the positioning of portions 51 and59 at points substantially spaced along passage 34 so that pressure inpassage 51 will be greater than that in passage 59. The exhaust gases inthe lay-pass, and especially in recess .58, will heat the wall of thecarburetor mixture passage within the throttle body and around thethrottle valve and idling ports so as to counteract icing tendencies.

As shown in Fig. 4, two of the carburetor attaching bolts pass throughopenings 60 in recess 58. Consequently, it will be necessary toeffectively seal these bolt holes by the use of gaskets.

Recess 58 may be easily formed in the casting process. Its exactconfiguration may be varied to obtain the best results. The inventionalso may be modified in other respects as will occur to those skilled inthe art and the exclusive use of all modifications as come within thescope of the appended claim is contemplated.

I claim:

In an internal combustion engine, an intake manifold having a riser witha flange, a carburetor having an end flange abutting and bolted to saidmanifold flange, there being a hollow channel in said flange andextending thereacross, a fuel passage in the wall of said carburetornear said end surface, an exhaust manifold having a branch passing inproximity to said riser and a second branch leading to atmosphere, anexhaust by-pass leading from said first branch upwardly along saidriser, thence along said channel and back to said first branch throughsaid riser, and a valve in said second exhaust branch for directing atleast substantial portions of the exhaust gases, respectively, throughsaid second branch to atmosphere or through said first branch and saidexhaust by-pass for heating said carburetor and fuel in said fuelpassage.

JAMES T. W. MOSELEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

